Why Do My Cranks Keep Coming Loose

So heres the deal truvativ cannot manufacture their splines properly resulting in your cranks coming loose. The fact that your crank arm gets undone means that.

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You could try tightening with lots of torque grease on the square taper and threadlocker eg.

Why do my cranks keep coming loose. If your crank arms flop with every pedal stroke or if you can wobble them from side to side fix them now before they become irreparable. Cleaned it all off the threads added some loctite thread lock and torqued it up. Blue Loctite but in a pinch any kind of glue works on the threads.

Most likely these screws are either stripped or damaged and no longer apply enough pressure to keep the crank arm in place. Cranks keep coming loose. Why does my left cranks arm keep on coming loose.

If this doesnt work the crank loosens after a short period of time or the bolt is missing. Mar 12 2009 1 yeh my crank keeps on coming loose and i keep on tightening it what is happening is it going to snap. Ive ended up applying some serious force to the bolt and so far its not come undone.

My cranks keep coming loose the bike is about a month old and Ill tighten them and they will come loose again after a few hours of riding can anyone help me. Some Truvativ cranksets use a shallower taper angle than the standard 2 degree taper if you have one of these pushed onto a standard tapered axle it will loosen much more readily. If youve been repeatedly riding with a loose crank arm it could be that its now damaged.

The issue with that type of crankset is that riding the bike with either arm being loose at all starts causing permanent damage. Discussion Starter 1 Jun 17 2009. The cranks would start working loose pretty quickly.

Jump to Latest Follow REVIEWS DEALS BIKESHOPS TRAILS. Given how easily I stripped a cranks pedal thread on a unicycle when it. Cranks constantly coming loose Hi guys been running into an annoying problem recently.

Start date Mar 12 2009. I have a FSA Comet crankset and chain ring side is constantly coming loose after a bit of riding. -if your crank is developing the profile wobble check and see if when the bolts are tight if the crank arm can be moved up down on the spindle slightly not side to side this indicates that your splines are wearing out is why it keeps coming loose-if your threads in the spindle and the bolt are still good and not stripped.

The splines on the crank arm can be ovalized or otherwise damaged if ridden when loose. I recently changed out my cranks after having a pedal come loose and ruining the threads so Im super-aware of the cranks being loose now. Crank loosefalls off.

Loc tite may work for a while but it will not continue to work for more then about 1. Thats because the spindle the axle the crankarms spin on is made of steel and the arms are aluminum. If the arm is damaged no matter how tight the bolt is torqued it will not stay tight on the spindle.

Look up the model specs or whip out your vernier gauge and compare the taper measurements. Re-torqueing the bolt will keep the arm on for a short amount of time but eventually will critically damage the crank arm bolt. Why does my crank arm keep coming loose.

The first thing to do is to try and re-tighten the crank arm on to the bottom bracket axle. Joined Aug 18 2005 2603 Posts. Why Do My FSA Cranks Keep Coming Loose.

1 - 8 of 8 Posts. This thread is archived. You can try locktite but Ive had no success with that either.

If youve been repeatedly riding with a loose crank arm it could be that its now damaged. Why does my cranks keep coming loose. Cranks For Shimano Ep8 Motor Mountain Bike Reviews Forum.

The left crank which is the one I use for rolling up onto the wheel keeps coming loose no matter how much I tighten the bolt. Done over 100 miles since and all seems good. Once cranks are loose its not difficult for the loosening motion to cause damage to the splines of the crank or the BB.

You could try tightening with lots of torque grease on the square taper and threadlocker eg. Crank keeps coming loose. As in standing on the arm of the ruddy Allen key.

Blue Loctite but in a pinch any kind of glue works on the threads. Had my right hand crank bolt come loose a couple of weeks ago on my Rail 7 and also found the shaft and threads were full of grease.

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